Two or multi cylinder internal-combustion engine



. A. 0. WENNERBY. TWO- 08 MULTI-CYLINDER INTERNAL COMBUSTION ENGINE.

' APPLICATION FILED JAN. 30, I922- 1,4=18,415. I I atentedJune 6,1922.

- 2 SHEETS-SHE ET I.

A. O. L. WENNERBY.

TWO- 08 MULTl-CYLINDER INTERNAL COMBUSTION ENGINE.

APPLICATION FILED mm. 30, 1922.

1,418,411.5- PatentedJune 6, 1922.

2 SHEETS-SHEET2Q UNITED ARTHUR OSKAR LEONARD WENNERBY, OF HALZMZS'I'AR:SWEDEN.,

TWO OR'MULTI CYLINDER INTERNAL-CO1VIBUSTION ENGINE.

To all whom it may concern:

Be it known that I, ARTHUR OSKAR LEONARD WVENNE BY, a citizen of Sweden,residing at Halmstad, Sweden, have invented certain new and usefulImprove-i ments in Two or Multi Cylinder Internal- Combustion Engines,of which the following is a specification, reference being had to theaccompanying drawing.

The present invention relates'to a compressor for twoor multi-cylinderinternal combustion ei'ig'ines, especially high-speed] two stroke cycleengines and the essential characteristical feature of the invention isthat a compression cylinder is provided between two or more adjacentworking cylinders coacting with the same in such a way that combustionair of a certain pressure at the right time will be introduced by thesame into both cylinders.

The invention is illustrated in the accompanyin drawing in which Fig. 1shows a two-cylinder two stroke cycle engine in a vertical sectionparallel to the crank shaft. Fig. 2 is a vertical section through thecompression cylinder perpendicular to the crank shaft.

I 1 indicates the crank shaft, 2 and 3 the two working cylindersprovided with the pistons 4 and 5. According to the invention acompression cylinder 6 isarranged be tween the two working cylinderssaid compression cylinder being provided with a hollow piston 7 havingat one of its sides an opening 8 of such a length that the interior ofthe piston 7 by means of a port 9 in the cylinder wall opposite saidopening always communicates with the open air (Fig. 2). The opening,however, is disposed in such a way that the compression chambers between the cylinder bottoms and the piston heads never directlycommunicate with the open air. The products of combustion are blown outthrough the openings 10 in the walls. of the working cylinders in amanner well known in two stroke cycle engines, and these openings arecovered by the working pistons when in their lower positions, as shownat the left part of Fig. 1.

A hollow member 11 serves as upper cover for all the cylinders saidmember communieating with the upper part of the working cylinders bymeans of passages 12 concentrically arranged around the fuel injectingnozzle. The passages 12 may be closed by means of a valve 14 arranged asa sleeve Specification of Letters Patent. Patented June 6., 19%2.

Application filed January 80, 1922. Serial No. 532,880.-

surrounding the fuel injecting nozzle and made to slide longitudinallyin relation to the latter, said valve being pressed into closingposition by means of a spring 13.

The valve carries at its centre a screen 15 4 a reciprocating motionfrom the crank shaft 1 by means of an eccentric 17 or in any othersimilar manner. Besides by the covers 11 and 16 the compression cylinder6 is covered by valve seats 18 and 19 at the' upper and lower ends andbetween the lower valve seat 19 and the cylinder cover 16 a chamber 20is provided which permanently communicates with the interior of thecover 11 by means of side passages 21 arranged around the compressorcylinder. In the seat 18 valves 22 are provided'which are to be openedonly towards the interior of the cover 11 but are closed automaticallyin the opposite direction. Similar valves 23 are to be found in the seat19 and these valves can only be opened towards the chamber 20 and thepassages 21. In the end faces of the compressor piston similar valves 24and 25 are provided which open in the same direction as the valves inthe adjacent bottom 18 or 19.

Thus the compressor is double acting as the piston on its downwardstroke compresses the air at its under side and blows it through thevalves 23 and the passages 21 to the hollow cylinder cover 11 and whenmoving upwards it compresses the air on the upper side and blows itthrough the valves 22 into the said hollow cylinder cover. At the sametime as compression takes place at the under side of the piston, suctionis effected through the passage 9 and the valves 24 to the space abovethe piston, and at the same time as the compression at the upper side ofthe pistonsuction takes place through the passage 9 and the valves 25into the space below the piston. The compression pressure acts alwaysupon the valves 14 but it is un able to open these against the pressurein the working cylinders, until the pistons in said cylinders reachtheir lower positions, when the cylinders are scavenged by the openingof the valves and fresh combustion air is introduced. Subsequently whenthe working pistons move upwards and. immediately after the closing ofthe openings 10 the valves 14: are closed again by the compressionbrought forth in the working cylinder, the fuel is injected andcompressed together with the air and it is ignited either automaticallyat the injection or in any other way, whereafter the working pistonsmake a new working stroke etc.

According to the invention described a supply of compressed air isalways at hand in the hollow cylinder cover 11 and this supply issuflicient to feed two or more cyl inders. Thus the necessary compressoris essentially simplified at the same time as the necessary valveconstructions in the manner described above also are much simplified.

Having thus fully described my said in vention what I claim as new anddesire to secure by Letters Patent is 1. Compression and fuel sprayingdevice for internal combustion engines having more than one workingcylinder comprising a double acting compression cylinder arrangedbetween the working cylinders and provided with a piston driven from thecrank shaft of the engine with the same speed as the working pistons,valves arranged at the opposite ends of the compres sion cylinder andconnecting both of said ends with a common compression chamber for allof the working cylinders, a common cover at the outer ends of all of thecylinders forming the compression chamber, said chamber enclosing aswell valves for the introduction of the compressed air and nozzles forintroduction of fuel into the working cylinders.

2. Compression and fuel spraying device for internal combustion engineshaving more than one cylinder comprising a double acting compressionpump having its cylinder arranged between two adjacent work ingcylinders; a piston arranged in the firstmentioned cylinder and drivenfrom the crank shaft of the engine with the same speed the workingpistons, valves arranged at both ends'of the pump cylinder andconnecting said ends with a com-men compression chamber for all of theworking cylinders, a common cover arranged atthe other ends of all ofthe cylinders and forming the compression chamber, said chambersurrounding as well the fuel nozzles and valves for introducing thecompressed air into the working cylinders and the latter being carriedout in the form of sleeves sur-

